The President is making another swing into town tomorrow, May 10th. That means you can expect lots of traffic tie-ups, which, in our bus-dominant world, means transit delays. Two major closures to be aware of are at Convention Place Station and Pine Street. Metro has more details here:
From about 9 a.m. to 4 p.m., Convention Place Station (CPS) in the Downtown Seattle Transit Tunnel will be closed to all pedestrian access. Buses will continue to travel through CPS, but will not stop there. No passengers will be allowed to board or exit buses in the station, or access the tunnel from the CPS entrance at 9th Avenue and Pine Street.
During this time please board or exit all tunnel buses at the other four tunnel stations, or at their regularly posted surface street stops before they enter or after they leave CPS. Sound Transit Link light rail service is expected to operate normally in the tunnel during this time.
Additionally, from about 9 a.m. to about 4 p.m. on Thursday, Pine Street will be closed west of I-5. During this closure there will be no bus service on Pine Street between I-5 and 3rd Avenue.